Hot water boiler for forced circulation heating systems



H. VORKAUF Spt. z, 1958 HOT WATER BOILER FOR FORCED CIRCULATION HEATING SYSTEMS Filed May 8, 1957 H S D Hi1; |L9 z M W 61 w f I J z} m H. mm 5/ m 7 Z MW L a n MW .w :m w m w 1 T I m M Y /K m 9% 4 Fiji.

'35 I5 34 4a 2a 30 INVENTOR. HEINRICH voRKAuF BY Wm M ATTOR NE Y United States Patent Q HOT WATER BOILER FOR FORCED CIRCULATION HEATING SYSTEMS Heinrich Vorkauf, Berlin-Schmargendorf, Germany Application May 8, 1957, Serial No. 657,968

Claims priority, application Germany May 14, 1956 Claims. (Cl. 122-235) The invention relates to a hot water boiler for a heatinp system with forced circulation and more particularly to a hot water boiler with a tubular framework and two tubular heating surfaces, one of which being formed of slightly heated serpentine tubes and the other one being formed of tubes intensely heated, chiefly by radiation.

In a certain conventional type of such boilers, the return water from the heating system is conducted first through the serpentine tubes into a collector from where it is led to the distributor of the intensely heated tubes. Such assembly has the disadvantage that a special conduit is required between the mentioned collector and distributor. In other conventional boilers, the water from the slightly heated tubes is conducted directly into the collector of the intensely heated group of tubes which causes the drawback that the temperature of the water supplied to the heating system is lower than that of the intensely even servere water-hammer where the cooler water is fed into the mixing zone.

The invention aims to 'aviod the drawbacks of the conventional boiler types and essentially aims to provide upper longitudinal elements of thetubular framework with partitions so that each upper longitudinal element has two parts intoone of which the water from the serpentine tubes enters and into the other one of which thewater from the intensely heated tubes is fed: y

Further objects and details of the invention will be apparent from the description given hereinafter and the accompanying drawing illustrating an embodiment thereof by way of example.

In the drawing:

Fig. 1 is a longitudinal section of a boiler according to the invention;

Fig. 2 is a section along line 2-2 of Fig. 1 and Fig. 3 is a cross-section of a modified part.

Referring now to the drawing, the illustrated boiler has a framework comprising front corner tubes and 11, rear corner tubes 12 and 13, upper longitudinal tubes 14 and 15 and lower longitudinal tubes 16 of which only one is visible in the drawing. The longitudinals communicate with the corner tubes to which they are connected. Thus, the one boiler side wall contains the tubes 10, 12, 14 and one tube 16, and the other side Wall contains the tubes 11, 13, 15 and the other tube 16. The

front wall of the boiler is denoted by 17, the rear wall by 18 and the ceiling wall by 19. A partition 20 extends upwards intermediate the walls 17 and 18 so as to leave I a passage 21 between its top and the ceiling wall 19. Substantially in the vertical median plane of the partition 20, the upper longitudinal tubes 14 and 15 are provided with partitions 22 and 23, respectively, dividing the longitudinals in parts 22, 22" and 23, 23", respectively. Contrary thereto, the lower longitudinal tubes 16 extend undivided, i. e. without any partition from the adjoining front corner tubes to the rear corner tubes of the same sides, respectively. The furnace or combustion Ice 2,849,989

space 50 extends between the front wall 17 and the partition 20. The grate 24 and charging opening 25 are visible in Fig. 1. A flue space 26 is formed between the partition and the rear wall 18 and communicates with the furnace through the passage 21 for the combustion gases.

A convection heating surface. comprising the serpentine tubes 27 is located in the flue space 26. The tubes 27 extend from a distributor 28 with inlet socket 29 upwards to a collector 30 which, in fact, is a transverse tube connected to and communicating with the longitudinal tube parts 22" and 23" close to the partitions 22 and 23. However, it is also possible to connect the tube 30 to the longitudinal parts 22" and 23" at points closer to the corner tubes 12 and 13.

Radiantly heated vertical tubes 32 extend between the lower longitudinal tubes 16 and the parts 22 and 23' of the upper longitudinals. At a relatively short distance above the front wall opening 25, a transverse tube 33 is connected between the front corner tubes 10 and 11. This tube 33 constitutes a distributor for radiantly heated front wall tubes 34 which are bent in their upper parts 35 so as to form ceiling tubes. These front and ceiling tubes open into a transverse collector 36 which is connected to the upper longitudinal parts 22 and 23' close to the partitions 22 and 23. Another transverse distributor 37 connecting the lower longitudinals 16 is located in the partition 20. From distributor 37, rear wall tubes 38 extend and open into the aforementioned transverse collector 36. Upper branches 39 of the tubes 38 may be provided and connected directly to the ceiling tubes 35.

Another transverse tube 40, forming part of the boiler frame, communicates with the upper ends of the front corner tubes 10-and '11 and the front ends of the upper longitudinal tubes 14, 15. Tube 40 has an outlet socket 41 from which hot water may be supplied to a heating system H'with its circulating pump P. The pump P, system H and. discharge conduit D of the return water are no parts of the present invention,

If now the whole heating system is connected between thevsockets 41' and 29, the return water will flow through thedistributorf28, serpentine tubes 27 collector 30, longiall the heated water is supplied to the heating system through the transverse tube 40 and socket 41.

Thus, a mixing of the cooler water from the slightly heated group of tubes with the water from the intensely heated group will be avoided so that no condensation noises or even water-hammer can occur. The invention has the further advantage that no special conduit is required in order to conduct the water from the serpentine tubes to the distributors for the radiantly heated tubes. Another advantage of the invention consists in that a natural circulation can take place in the radiantly heated system if the flow through the heating system is interrupted, as the hot water can flow down from the upper collector tube portions 22' and 23' through the front corner tubes to the longitudinal distributors 16 and the transverse distributors 33 and 37.

It will be noted that in the regular operation of the boiler, the connections between the transverse collector 30 and the longitudinal portions 22" and 23" are the highest points of the paths of the water coming from the serpentine tubes. In consequence, there is the possibility of air collecting at these points. In order to prevent the Patented Sept. 2, 1958 3 formation ofsuch air pockets, deaerating tubes 42, 43 may be provided which connect the portions 22', 22" and.23, 23", respectively. Then, the current of. water flowing in the direction from the partitions 22 and 23 towards the outlet socket 41 will entrain any air from the tube portions 22" and 23!.

Instead of the deaerating tubes 42, 43 small holes 44 may be provided in the partitions 45 of the upper longitudinal tubes, as shown with respect to the tube 14 in Fig. 3. This figure also indicates that the tube 14: con

sists of two pieces 14a and 14b, welded together at 140 in order to render the installation of the wall 45 possible.

It will be apparent to those skilled in the art that many alterations and modifications of the structure shown and hereinbefore described can be made without departure from the essence and spirit of my invention which, for that reason, shall not be limited but by the scope of the appended claims.

I claim:

1. In a hot water boiler for heating system with forced circulation and including a pump, the combination of a tubular boiler framework including two upper and two lower longitudinal tubes and two front and two rear corner tubes connecting each the ends of an upper and a lower one of said longitudinal tubes, a partition in each of said upper longitudinal tubes so as to divided each of said tubes in a front and a rear part, each lower longitudinal tube extending undivided through between the connected front and rear corner tubes, a distributor adapted for connection with said heating system so as to receive return water therefrom, a heating surface including a transverse collector tube connected between said rear parts of said upper longitudinal tubes and a set of slightly heated serpentine tubes connected between said distributor and said transverse collector, and another heating surface including tubes intensely heated predominantly by radiation and connected with said front parts of said upper longitudinal tubes and with said lower longitudinal tubes, and means for connecting said front parts to the inlet side of said heating system.

2. In a hot water boiler for a heating system with forced circulation and including a pump, the combination of a tubular boiler framework including two upper and two lower longitudinal tubes and two front and two rear corner tubes connecting each the ends of an upper and a lower one of said longitudinal tubes, a partition in each of said upper longitudinal tubes so as to divide each of said tubes, in a front and a rear part, each lower-longitudinal tube extending undivided through between the connected front and rear corner tubes, a convection heating surface including a set of serpentine tubes, a distributor connected to said serpentine tubes and adapted for connection with said heating system so as to receive return water therefrom, and a transverse collector connected to said serpentine tubes and also connected to said rear parts, of said upper longitudinal tubes, and a second heating surface including radiantly heated vertical tubes extending between said front parts of said upper longitudinal tubes and, said lower longitudinal tubes, and an upper transverse tube connecting the front parts of said upper longitudinal tubes and being adapted for connection with said heating system so as to supply hot water thereto, whereby said lower longitudinal tubes constitute the distributors and said front part of said upper longitudinal tubes constitute the collectors for said radiantly heated tubes.

3. A boiler as claimed in claim 2, further comprising another upper transverse tube connecting said upper longi tudinal tubes closely to said partitions, a lower transverse tube connecting said lower longitudinal tubes substantially near a vertical plane through said other upper transverse tube, another set of radiantly heated tubes between said other upper transverse tube and said lower transverse tube, another lower transverse tube connected to and extending between said front corner tubes at a distance from said lower longitudinal tubes, and a third set of radiantly heated tubes forming front and ceiling tubes and extending from said other lower transverse tube to said other upper transverse tube.

4. A boiler as claimed in claim 2, further comprising a deaerating tube for each upper longitudinal tube, said deaerating tube connecting said front and rear parts of the associated longitudinal tube closely to said partition thereof.

5. A boiler as claimed in claim 1 wherein each partition is provided with a small hole in its uppermost portion.

7 References Cited in the file of this patent UNITED. STATES PATENTS 581,518 Roney et a1. Apr. 27, 1897 FOREIGN PATENTS 1,081,322 France June 9, 1954 

